Datagrid labelfunction sort problem

Question

I have a problem with sorting on all columns the moment I
implement a labelFunction in a datagrid. When I click the datagrid
headers nothing happens anymore. I need the labelFunction in the
first place to format some data.
Does anyone has a solution for my problem?
Here's the code (fragmented):
<mx:DataGrid id="dgUsers" dataProvider="{aUsers}">
<mx:columns>
<mx:DataGridColumn headerText="number"
labelFunction="dispUsers"/>
<mx:DataGridColumn headerText="name"
labelFunction="dispUsers"/>
<mx:DataGridColumn headerText="role"
labelFunction="dispUsers"/>
</mx:columns>
</mx:DataGrid>
private function dispUsers(item:Object, column:
DataGridColumn):String {
switch(column.headerText) {
case "number":
return item.username;
case "name":
return formatName(item.voornaam, item.tussenvoegsel,
item.achternaam);
case "role":
return item.roleName;
default:
return "";
private function formatName(sVoor:String, sMidden:String,
sAchter:String):String {
var sName:String = "";
if(sAchter != "") {
sName += sAchter;
if(sVoor != "") {
if(sName != "") {
sName += ", ";
sName += sVoor;
if(sMidden != "" && sVoor != "") {
sName += " " + sMidden;
return sName;

Answer 1

Because you have a labelFunction, the DataGrid now needs a
sortCompareFunction to tell it how to sort your data. Here is some
extra info.
http://livedocs.macromedia.com/flex/2/docs/wwhelp/wwhimpl/common/html/wwhelp.htm?context=L iveDocs_Parts&file=00000598.html
Joan Lafferty
Flex SDK QA